They include Kate's cousin Lucy Middleton, Nicholas van Cutsem, whose daughter was a bridesmaid at May's wedding of Harry and Meghan, and Guy Pelly, a childhood friend of William's.

Experts point to Prince Louis' christening ceremony earlier this week that perfectly balanced the need for the family's privacy, whilst allowing royal watchers the chance to celebrate Prince Louis - which they say was all Kate's doing. She also wore her hair in a low chignon, topped with a white, flowered headpiece.

A beaming Duchess of Cambridge cradled PrinceLouis in her arms as she carried him home following his christening on Monday afternoon.

It was the first time the Duke and Duchess of Cambridge and their three children have been seen together as a family of five.

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The monarch, 92, and her 97-year-old husband Prince Philip had attended the christenings of Louis' older siblings Prince George and Princess Charlotte.

"A "feu de joie" (ceremonial gunfire) and a spectacular fly-past of RAF aircraft past and present illustrated the history and might of the Royal Air Force and showed just how far its aircraft have evolved in the past century", the royal family's website states.

The private ceremony is expected to last around 40 minutes, but the Queen and the Duke of Edinburgh will not be among the attendees.

It's understood he's keen to build up a library for his nephews Prince Louis and Prince George, 4, and niece Princess Charlotte, 4, in memory of the late Princess Diana.